Component description for battery management system control unit - GF54.10-P-3012RFH

ENGINE 274.920 in MODEL 205.047/147/247 

ENGINE 651.921 in MODEL 205.012/212 

Shown on model 205.012 

Shown on high-voltage battery module 

Shown on model 205.047 (except model 205.012/212) 

Shown on high-voltage battery module (model 205.047/147/247) 

Location 

The battery management system control unit is integrated into the high voltage battery module.

Interlock circuit

The interlock circuit is used as contact protection to protect people against inadvertent contact with high-voltage components. The interlock is an anticipatory contact which opens a little before the high-voltage connections when opening a high-voltage connection. In this way timely discharging of the high-voltage intermediate circuit is achieved by the control units of the high-voltage components.

In order to do this, a 12 V/88Hz interlock signal is looped through all components of the high-voltage on-board electrical system that are can be removed or opened. To do this there is an electrical bridge in each removable high-voltage connection which interrupts the interlock circuit during removal of the high-voltage connection. The interlock circuit is also switched in series via the 12-V control unit plug connections of the high-voltage components.

Tasks 

The battery management system control unit operates in an electrical network with the sensors and actuators of the high-voltage on-board electrical system to provide battery management of the high-voltage system.

The battery management system constantly determines and monitors the following high-voltage battery data:

• Interlock circuit
• Voltage
• Current flow
• Temperature
• State of contactor

The battery management system control unit is connected through the hybrid CAN (CAN L) to the vehicle's CAN network and exchanges data with the other control units.

Input and output signals 

• Direct input/output signals 
• Output connectors 
• CAN input/output signals 

Input factors and output factors for the following components are read in or output over direct lines by the battery management system control unit:

Input factors over a direct line	Initial parameters over a direct line	Supplemental information
Terminal 15	-	-
Circuit 30	-	-
Circuit 30c (crash signal from pyrofuse (F63))	-	-
Crash signal	-
Circuit 31	-	-
Interlock circuit	Interlock circuit	-
High-voltage battery cell temperature sensors (A100b2)	-	-
-	High-voltage battery cooling shutoff valve (Y19/1)	Model 205.012/212

The following components are connected to the battery management system control unit via power connections:

Output connections +	Output connections -	Supplemental information
Power electronics control unit (N129/1) (discharge current from high-voltage battery (A100g1))	Power electronics control unit (N129/1) (discharge current from high-voltage battery (A100g1))	-
Power electronics control unit (N129/1) (charging current to high-voltage battery (A100g1))	Power electronics control unit (N129/1) (charging current to high-voltage battery (A100g1))	-
Charger (N83/5) (charging current to high-voltage battery (A100g1))	Charger (N83/5) (charging current to high-voltage battery (A100g1))	Model 205.047/147/247

Input factors and output factors for control units are sent or received by the power electronics control unit via LIN or CAN:

Input factors over battery sensor-LIN (LIN B15)	Initial parameters over battery sensor-LIN (LIN B15)	Supplemental information
-	Low-temperature circuit switchover valve 2 (Y73/2)	Model 205.047/147/247

Input factors via hybrid CAN (CAN L)	Starting data via hybrid CAN (CAN L)	Supplemental information
Charger (N83/5)	Charger (N83/5)	Only on model 205.047/147/247
Powertrain control unit (N127)	Powertrain control unit (N127)	Contains signals of further control units which are connected via the CAN network.
Power electronics control unit (N129/1)	Power electronics control unit (N129/1)	-

Wiring diagram for battery management control unit

PE54.10-P-2104-97FBA